Generation of mode-locked pulses assisted by reduced graphene oxide/cerium oxide (rGO/CeO2) embedded in arc-shaped fiber

Document Type

Article

Publication Date

12-1-2024

Abstract

This study demonstrates the synthesis of a reduced graphene oxide/cerium oxide (rGO/CeO2) composite and its successful use as a saturable absorber (SA) in ultrafast photonics. The rGO/CeO2 composite was synthesized using a facile hydrothermal approach, and an arc-shaped fiber was fabricated using a polishing technique. The arc-shaped fiber employed indirect evanescent field coupling, allowing interaction between the composite material and the laser, and facilitating the generation of mode-locked pulses. An arc-shaped fiber drop-casted with rGO/CeO2 was connected to a 2.0 mu m laser source, achieving a modulation depth of 50.16%. The emitted laser pulses have a duration of 1.428 ps, an operational wavelength of 1904 nm, and a spectral bandwidth of 2.76 nm. The pulse energy was 1.92 nJ with a high signal-to-noise ratio (SNR) of 50 dB. This study introduces rGO/CeO2 embedded in an arc-shaped fiber as an effective SA, exhibiting favorable nonlinear optical absorption in the near 2.0 mu m wavelength region, making it suitable for applications in ultrafast photonics.

Keywords

mode-locking, saturable absorber, arc-shape fiber, reduced graphene oxide, cerium oxide, composite

Publication Title

Physica Scripta

Divisions

PHYSICS,photonics

Funders

Ministry of Higher Education, Malaysia https://doi.org/10.13039/501100003093,Ministry of Education, Malaysia (PRC-2022),HiCoE (GA043B-2023),Ministry of Economy, Malaysia (IIRG001A-2023) ; (IIRG001C-2023),Universiti Malaya

Volume

99

Issue

12

Publisher

IOP Publishing

Publisher Location

TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND

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